<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="utf-8">
    <meta content="yes" name="apple-mobile-web-app-capable">
    <meta content="yes" name="apple-touch-fullscreen">
    <meta content="telephone=no,email=no" name="format-detection">
    <script src="http://g.tbcdn.cn/mtb/lib-flexible/0.3.4/??flexible_css.js,flexible.js"></script>
    <link rel="apple-touch-icon" href="favicon.png">
    <link rel="Shortcut Icon" href="favicon.png" type="image/x-icon">
    <style>
    .testBox {
        width: 4rem;
        height: 3.2rem;
        border: 1px solid #ddd;
        margin: 3rem;
        box-sizing: border-box;
    }
    </style>
</head>

<body>
    <div class="testBox">
        我是iphone6 宽300px
    </div>
</body>

</html>